Kaluza-Klein Dark Matter

Abstract

We propose that cold dark matter is made of Kaluza-Klein particles and explore avenues for its detection. The lightest Kaluza-Klein state is an excellent dark matter candidate if standard model particles propagate in extra dimensions and Kaluza-Klein parity is conserved. We consider Kaluza-Klein gauge bosons. In sharp contrast to the case of supersymmetric dark matter, these annihilate to hard positrons, neutrinos, and photons with unsuppressed rates. Direct detection signals are also promising. These conclusions are generic to bosonic dark matter candidates.

Chiral Compactification on a Square

“…When all fields satisfy boundary conditions with l = 0, then Z 2 = Z KK 2 . In either case, the Z 2 symmetry guarantees the stability of the lightest Kaluza-Klein mode, which may play the role of dark matter [24,25].…”

“…The loop induced localized operators automatically satisfy this requirement, and therefore it is natural for the above theories to contain the KK-parity symmetry Eq. (4.23), which implies that the lightest KK mode, with (j, k) = (1, 0), is stable, and a good dark matter candidate [24,25].…”

“…Therefore, f (j,k) + R depends on an integer that can take four values, n + R = 0, 1, 2, 3, and for each of these cases there is a solution where j and k are integers (a case labeled by l + = 0), and a different solution (l + = 1) where they are half-integers. Given one of these solutions for f (j,k) + R , the first equation in (3.24) determines f (j,k) + L and gives a solution of the same form except for a shift by one in n + R and an overall phase factor: 25) where f (j,k) n is given by Eq. (2.37).…”

Search for gamma rays from dark matter annihilations around intermediate mass black holes with the HESS experiment

“…In KaluzaKlein (KK) scenarios with KK-parity conservation, the lightest KK particle (LKP) is stable. Most often, the LKP is the first KK mode of the hypercharge gauge boson, referred hereafter to asB ð1Þ [5][6][7]. In the Kaluza-Klein case, the BRs are extracted from [7].B ð1Þ pairs annihilate mainly into fermion pairs: 35% in quark pairs and 59% in charged lepton pairs.…”

“…[1], commonly assumed to be in the form of weakly interacting massive particles (WIMPs) arising in extensions of the standard model of particle physics (for recent reviews see [2,3]). The lightest neutralino arising in supersymmetric (SUSY) extensions of the standard model [4], and the first excitation of the Kaluza-Klein bosonsB ð1Þ in universal extra dimension (UED) theories [5][6][7] are among the most widely discussed dark matter candidates.…”